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WOAP 4 meeting, Hamburg, 29 – 31 March 2010 II. Detection, attribution and prediction of stratospheric changes Quantification of stratospheric ozone and temperature changes WAVAS-2 (WAter Vapour ASsessment) provides an update of the Assessment of Upper Tropospheric and Stratospheric Water Vapour Report (SPARC report #2) published in 2000 SPARC Science objectives up to 2013 Documentation of the state of the polar vortices during the IPY period (maintenance of SPARC-IPY data archive) Improve understanding of natural variability of key stratospheric variables in order to detect and attribute stratospheric long-term change SOLARIS (SOLar Influence study for SPARC): Improvment of understanding of solar influences on climate